Voltage Divider Calculator

Your details

Pick which quantity to calculate; fill in the other three.
The supply or source voltage feeding the divider.
V
The desired voltage at the midpoint between R1 and R2.
V
The desired voltage at the midpoint between R1 and R2.
V
Upper resistor (between Vin and Vout).
Lower resistor (between Vout and ground).
Enable to account for a load connected across R2.
Output Voltage (Vout)
3.3333V

Voltage at the midpoint of R1 and R2

Input Voltage (Vin)5V
R1 (solved)1.000 kΩ
R2 (solved)2.000 kΩ
Voltage ratio (Vout/Vin)0.6667
Divider current1.667 mA
Power in R12.7778 mW
Power in R25.5556 mW
Total divider power8.3333 mW
Vout3.3333
Vin5

Vout = 3.3333 V from Vin = 5.0000 V

  • The output is 66.7% of the input - the divider steps down by a factor of 1.50.
  • Quiescent current through the network is 1.667 mA. High quiescent current wastes power; low current increases sensitivity to load effects.
  • Total power dissipated by R1 and R2 is 8.3333 mW. Select resistors rated at least twice this to avoid overheating.

Next stepCross-check your resistor values against the E24 or E96 standard series to find the nearest available part.

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